feat: Add methods for window settings in Application

This commit adds new methods to the `Application` struct for setting various window settings such as resizable, decorations, position, and level. These methods allow for more customization and control over the appearance and behavior of the application window.

src/application.rs

@@ -256,6 +256,50 @@ impl<P: Program> Application<P> {
         }
     }
 
+    /// Sets the [`window::Settings::resizable`] of the [`Application`].
+    pub fn resizable(self, resizable: bool) -> Self {
+        Self {
+            window: window::Settings {
+                resizable,
+                ..self.window
+            },
+            ..self
+        }
+    }
+
+    /// Sets the [`window::Settings::decorations`] of the [`Application`].
+    pub fn decorations(self, decorations: bool) -> Self {
+        Self {
+            window: window::Settings {
+                decorations,
+                ..self.window
+            },
+            ..self
+        }
+    }
+
+    /// Sets the [`window::Settings::position`] of the [`Application`].
+    pub fn position(self, position: window::Position) -> Self {
+        Self {
+            window: window::Settings {
+                position,
+                ..self.window
+            },
+            ..self
+        }
+    }
+    
+    /// Sets the [`window::Settings::level`] of the [`Application`].
+    pub fn level(self, level: window::Level) -> Self {
+        Self {
+            window: window::Settings {
+                level,
+                ..self.window
+            },
+            ..self
+        }
+    }
+
     /// Sets the [`Title`] of the [`Application`].
     pub(crate) fn title(
         self,